Upon arrival at the breeding grounds, the female builds a thick-walled nest lined with fine grass, rootlets, plant down, feathers and hair. This thick lining helps keep eggs and nestlings warm, but the female still must remain on the nest for most of the 4-10 day incubation period. The male feeds her during this time. Nests are usually built in protected crevices and rock cavities. Each season, Snow Buntings lay 4-6 eggs, which are white with a ring of reddish brown spots around the larger end. Chicks fledge 10-15 days after hatching.